Melting-pot and metal-injecting mechanism for type-casting machines



I. T. CARTER. NELTTNG POT AND METAL TNJECTTNG MECHANTSNT FOR TYPE CASTING MACHINES.

APPLICATION FILED APR. I3, 1920.

Patented July 6, 1920...

5 SHEEIS-SHEEI I.

I. T. CARTER.

TING MECHANISM FOR TYPE CASTING MACHINES.

` APPLICATION FIIED APH. If. 1920. '1 SQQU'T/fu Patented July 6, 192(I 5 SHEETS-SHEET 2.

IVIELTING POT AND METAL INJEC d/wg Mfr@ @y J. T. CARTER. MEETING POT AND METAL INJECTING MECHANISM FOB TYPE CAST! NG MACHINES. Patented July 6, 1920,

APPLICATION FllED APR. 13, 197,0.

5 sHEErssHEr-:l s.

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1.4T. CARTER. MEL'TING POT AND METAL NJECTING MECHANISM FOR TYPE CASTIN e MAHINEs.

. Patented July 6, 1920.

AP-PLICATION FILED APR. I3. i920*- 5 SHEES-SHEEI 4.

J. T. CARTER; MEETING POT AND METAL INIECTING NIECHANISIVI FOR TYPE CASTING MACHINES.

mm APPLICATION FILED APR. I3, ICIZO. 19346.@ I f.

Patented .Tuly 6, IIOZO.

JAMES THOMAS CARTER, 0F BALTIMORE, MARYLAND.

MEETING-POT .AND METAL-KNJ'ECTNG MECHANISM FOR TYPE-GAMING- MACHINES.

asienta Application tiled April 13,

To all whom t may concern:

.Be it known that ll, JAMES THOMAS CARTER, a citizen ofthe United States, residing in the city of Baltimore and State of Maryland, have jinvented certain new and useful improvements in Melting-Pots and Metal-injecting Mechanisms for Type-Casting Machines; and I do hereby declare the `following to be a full, clear, and )exact -de- -machines, which will be simple in construction, thoroughly practical, from a manufacturing standpoint, and entirelyecient and` .positive in action.

A further object is to provide a device, of the character described, provided with a pump plunger for causing a forced feed of the -molten metal, in combination with a novel and peculiar form of hollow valve rod for governing the supply and shut 0E of the molten metal to said pump.

A lfurther object is to provide, in a device Vof the character described, a choker valve to control the discharge of molten metal to the type mold, and a novel means for governing the movement thereof, said mechanism including safety means, as will be more particularly hereinafter described. l

The invention also has in view certain other objects, going to make up the ultimate perfection of the device as an entirety, as

,will be apparent as the vspecification pro' ceeds.

The invention is shown in anexemplary forml in the accompanying drawings," in which like reference characters designate corresponding parts throughout the several views. The' dierent igures `or views may be brieiiy describedns follows 'Figure v1 isf-a central vertical sectional view of the melting pot and metal injecting mechanism constructed in accordance with o my invention, certain parts being shown in elevatio'n, and showingthe position of the pump plunger, the hollowvalve rod, and the choker valve, at one period of the operation of the device.

Specification of Letters Patent.

'ratenteaaaiy c, ieee..

1920. Serial No. 373,680.

Fig. 2'is a similar view showing the pol sition of said parts at a dierent stage 'in the operation of the device. f

Fig. 8 is a detached detail View, partly 'in section, of the choker valve spindle and certain related parts.

Fig. 4." is a detached detail view, in -front end .elevation of the jet nozzle.

F1g. 5 is a fragmentary detached detail view, 1n slde elevation, of the hollow valve ro ofA the Ymechanism for operating the choker valve spindle, and also showing the safety means.v i

Fig.l 7 is a central vertical sectional view *of a slightly modified form of melting pot.

Fig. 8 is 'a` sectional view along the line 8 8 of Fig. 7.

Fig. 6 is a detached 'detail view, in section,

.Figs 9 and i0 are views similar to Figs. 4

7 andS, respectively, but showing the position of the moving parts at a dierent stage in the operation.

Fig. 11 is a view in side elevation of the melting pot, and l Fig. 12 is a sectional view on the line 12,12 of rig. i1.

Referring now in detail to the drawings, and rst to Figs. 1 to 6 inclusive thereof:

l designates a melting pot, functioning as' a storage reservoir for the ,molten type metal. As shown in the drawings, the melting pot is provided with two vertical cylindrical chambers 23a and 23". The walls of one,the pump plunger well chamber 23%,-,-

rise above the inside bottom surface of the 1- pot, and form a guide boss 2l for the pump plunger 22 which has aI working lit and is j arranged to slide up and down in same.V

.upper limit flush with the inside bottom surface vof the melting Vpot and descends a ,take a choker valve 37 with a single-valve- Thel other cylindrical chamber 23b has its -Q seat on its outer end, IThe' rearl portion 36' of the choker valve 37 slidably fits the smaller and innermost diametrical part of the stepped chamber 29, which smaller part acts `as a guide for same. part of this stepped chamber extends beyond the outside of the melting pot in the form of a hollowT boss 30, and this is threaded for a suiiicient amount to take a hollow cylindrical extension piece 31 with a conical nose 33 which acts as a jet nozzle.

This nozzle has thin walls which taper down upon approaching extreme nose, and

is further provided at vthis point withaninner and outer valve seat of beveled,V construction, the outer seat forming a joint with the mold nipple plate 63, and the internal valve seat is ,arranged to ,suit the choker valve, which controlsy the flow of type metal to the mold, through the opening 34 inthe center of thenozzle 33.

The stepped cylindrical chamber is con- -nected at the enlarged space 29, between the choker valve guide ortion 35 and the nozzle 33, with an incline passage 28, whose lower end communicates directly with the pump plunger well 23, and connecting passage 2 5,

and the inclined passage 28. This serves to allow thel choker valve body 37 to reciprocate to and from its seat with perfect freedom against accidentally 4trapped metal at the rea'r vof said choker valve body.

' The melting pot is further provided with a hpllow boss 40', extending outside the walls of said melting pot, the ,centralportion of which. consists of several successive diameters, and a beveled edge to act as a valve seat.' The outside diameter of the innermost portion of this chamber cuts into the nipple valve guide chamber 35, a determined agnount controlled by the driving means 40.

' The boss described is also threaded at the extreme outer part of itself to take a,- retainingnut. l

he driving means 40 or choker valve Opf erating spindle is arranged with a small circular portion, to be supported as a working it in the extreme innermost diameter of the hollow boss 40. l

The pot `is further provided atits upper portion with an outward extending marginal.'

ange 3 through which and through a. corresponding ange 4 at the top of the hood 5 passes securing means, such as screws '6, whereby the melting pot is removably attached to said hood and whereby, also-,'latl eral adjustment is permitted. 'f

ing below the bottom 2 of pot C1, and is pro The outer vided in its. side walls with an opening 7, normally closed by an observation door 8, hinged as shown at 9, 9,4on ears 10, 10, carried by the exterior of the hood. Projecting into the bottom of said hood 5.is a burner 11 carried by a T-union 12, coupled with which are pipes .13 and 14, the pipe 13 constituting ay fuel supply pipe and leading from a suitable source of fuel supply, and the pipe 14 being coupled at its end with union 15 in which is screwed apilot pipe 16 extending upward and provided with a curved upper enelv projecting through an aperture 18 n the wall of the hood 5.

` The hood'is preferably formed so as to be swung in thefarc of a circle and for this purpose maybe'provided with a flange 19 (Fig. (11), through which a pivot pin or hinge member may pass for pivoting or hinging s'aid hood 5 to a type casting machine. The hood.5 may also be provided with a ange 20 adapted to engage with a latehing device on the type casting machine,

so as'to secure same 'against displacement.

The pump plunger 22 is solid, and serves, upon its downward stroke, to' eject the type metal, under spring pressure, taken from a driving member when the pot is swung into working position in the machine.

The' hollow feed valve rod 23 has a cavity 26 in its lower portion, or even substantially throughout its entire length, and at a suitable ydistance from the bottom is provided with an elongated port 27, cutting through the .circumferential side wall. This vrod 23 is arranged to reciprocate, and in so doing,

.alternately'covers and uncovers thelportA 25, vthereby controlling the flow of molten type metal-to the pump plunger well 23a. The path of the metal being from the body of the metal in the pot, through the elongated port 27 in the side wall of the hollow valve rod 23, downward through central cavity 26, along the hollowv feed valve well chamber 23", through passage 25 and directly into pump plunger well chamber 23a; and metal continues to flow into this well cavity, as pump plunger rises to'make room for same, due to the double iniiuence of gravity and suction, until the hollow feed valve rod 23 descends and shuts olf the port 25.

. It will be noted that due to its construction, the hollow feed valve rod, is free to rise and fall, and cannot possibly trap any metal, as the central cavity 26 with its elongatedport 27, at all .times forms a means of escape for any metal in the well cavity 23". Also the location of theelongated port 27 is such than the highest 'ptsition ofthe rod 23, it is always possible to drain the pot.

The choker ,valve 37 is of cylindrical construction and differs from the usual type,

valve seat',*an d this controls'the discharge and shutoff through the nipple nose, and

j y. linasmuch as it is possessed of only one The hood 5 1s anfopenvended shell depend! intacte.

i does not have anything to do with the 'eed-' ing of the metal, as in the usual type of choker valve in existing machines,provided with two valve seats one front and one back for this purpose. The. choker valve 37 is provided with a transverse notch 38, lovcated in about the center of the body part. This notch 38 is arranged to. it a toothshapedvportion 39 on the choker valve operating spindle 40. llt should be .noted'that the tooth-shaped part of the choker lvalve driving .spindle is Hattened ofi' at the'base.

part entirely across spindle diameter on one side only, the function of this being to aid in disassembling'the parts, as upon swinging the pot and removing the jet nozzle, by

fsimply turning the operating valve spindle,

so `that the iiattened portion lies parallel with the axis of 'choker valve, the choker valve',rnay be withdrawn without taking out orfurther displacing anything connected with the choker valve operating spindle.

rlhe axis of the choker valve and choker valve operating spindle are, as shown, at

Vright angles to each other, Awith a small 'amount of space betweenthe centers. llt is evident that the choker valve operator could be placed either above or below, and

` ever, the preferred arrangement is with 'the operating spindle underneath, as shown in'V with the axis displaced from the normal position, and still function correctly. How- Fig` 7. l he driving end of the operating spindle projects through a boss 40 provided for same, and outside of the melting pot, and is further providedl with a valveseat at 40a to prevent metal leakage, the valve being' kept on its seat by means-of a spring 40d and retainer 40, and this also tends,

through its lapping action, toV keep the valve. seat in good condition. The diameter at 40e., beyond the valve seat, is reduced to take a driving pinion 41,-which is'suit-f ably attached. Extending farther, and

Vproperly mounted upon extensionbore of' the driving pinion '41,.is a shortarln 64 .being locked to same, so that the whole of the three members oscillate as one piece. The

function of the short arm is .to 'furnish v means for operating choker valvebyhand, and alsoto always tend to close same when melting pot is swung-out of-an'iechanical`-er1- in.a correspondingly shaped opening 45, 'p

gagement withthetype casting machine,

the closing force inthis case lbeing a helical spring 67 reacting between an adjusting `screw 66 on the melting pot hood 5, and the end of the short arm ,64.l

As before noted, the segmental pinion'41 meshes with a rack 42, carried by va resiliently supported member 43, comprising, as

shown, a tubular portionv44, reciprocating extending through a stationary member46,

`constituting partv oi the main body'casting of the machine. 'llhe memberv 43 isv provided with aelongitudinally extending, or axial, opening 47, through which slidably projects a rod 48, carried at its lower' end by a head 49. Secured to saidplunger, or

head 49, as by means of screws 50, 1s ay bracket 51, carrying depending parallel ears 52, in which is supportedv an axle 53 of a roller 54. rlFhe'bracket also carries a wing or curved guard 55. The-roller 54 is adapt- -'ed to be engaged by a cam 55', carried by a vcam shaft 56.

l 46, is a coiled spring 62, which Ifunctions to return the rack 42 to normal position after movement thereof through the cam O55'.

- ln operation, the power of the spring 57 isl suiiicient to overcome-that ofthe spring 62, the latter being a weaker spring, and, as the roller 54 rides up on the cam 55'-, the yplunger 49 is raised, and thereby, through the spring57, the rack 42 is also elevated', rotating the segmental gear 41, thereby. turning the spindle 40 and reciprocating the choker valve 36. When the roller 54 becomes disengaged from the cam 55', the spring 62, which has been compressed by the elevation of the rack 42,-4 unctions to move the rod 48 and rack-carrying member 43 and the 4.plunger v49 to normalv position.

The spring 57 functions as a safety means, 'in that, should the choker valve operating f spindle 40 become jammed, and consequently immovable, preventing movement of the.

rack-carrying member 43, the rod 48 will slide through the rack-carrying member, the spring 57 compressing. By this ar-` rangement, breaking of vthe parts isl prevented. i f

lllteferring new in detail to Figs. 7 to-.12 of the" drawings These figures show a slight modification, in which, instead'of the pump and valve being disposed in substantial alinement with the .choker valve, as in the preceding-iigures of the drawings, l dispose the pumpI choker valve 36', so that the latter occupies Feo' rio-g `22 and the valve 23' oir each side ot the a position between the pump and the valve,

as shown.

posed beneath the choker valve 36', instead of above the same,\as in the preceding gures of the drawings. Also, instead of the lunger well 23", the port 25', thel valve well 26' and the inclined passage ,28' being Also in Vthis modilicatiomthe Vchoker valve operating spindle v40' is disinthe same vertical plane as in the preceding igures of the drawings, said inclined passage 28 is in this 'modified form disposed in a vertical plane at right angles to said pump well and valve well. 35 designates the passage, or recess, in which the choker valve 36 reciprocates. [The operation of this modified form is precisely the same as that described in connection with the forms shown in the preceding figures.

What I claim to be new is: l.l In type( casting apparatus, metal injecting mechanism, comprising a melting pot having at its bottom athickened portion, chambered to provide a pump well and a valve well,v a port connecting the said wells, z and an exit passage leading from said pump Well, a pump, comprising a plunger movable into and out of said pump well, and a valve, -comprising a plunger movable into and out ofv said valve well, so as to close and open passage through said port connecting said valve well and said pump well, said valve plunger being provided with.

a hollow portion extending from its bottom and communicating in all positionsof movements of said valve with the interior of said j melting pot,

ypot having at its vbottom a thickened por'- tion, chambered to provi/de a pump Well and -a valve well, a port connecting the said wells, an exit passage leading from said pump well, a pump,comprising a plunger movable into and out of said pump well, and a valve, comprising a plunger movable into and out-of said valve well, so as to close and open passage through said port connecting said valve well and said pump well, said valve plunger being provided with a hollow portion extending from its bottom, said valve being provided `with a slot in the wall of said hollow portion, commjinicating in allJ positions of movement of Jsaid valve melting pot, of a choker valve controlling the exit ofmolten metal from said pot, and

with the interior of said melting pot.

3. In type casting apparatus, metal'in'- jectig mechanism, comprising av melting pot aving at its bottom a thickened portion, chambered to providea pump well and a valve well, a port connecting the said wells, an exit lpassage leading ltrom said pump well, a pump, comprising a plunger movable into and out of` said pump well,

anda valve, comprising a plunger movable into and out of said valve well, so as to close and open passage through said port connecting said'valve welly and said pump A E I well, said valve plunger being provided with a hollow portion extending from its bottom,

and communicating'in all positionsuof movements of said valve with the interior of said melting pot, said melting pot carrying a miao?? nozzle communicating with said exit passage.

4. In type` casting apparatus, metal injecting mechanism, comprising a melting' pot having at its bottom a thickened portion, chambered to xprovide va pump well and a valve well, a port connecting the said wells, an exit passage leading from said pump well, a. pump, comprising a plunger movable into and out of said pump well, and a valve, comprising a'plunger movable into and out of said valve well, so as to close and open passage through said port connectin said valve well and said pump well, said -va ve plungerbeing provided with a hollow portion extending from its bottom, and communicating in all positions ofmovements of said valve with the interior of said melting pot, said melting pot carrying a nozzle communicating with` said exit passage, and a choker valve adapted to control passage throu h said nozzle.

5. n metal injecting mechanism for type casting machines the combination with a melting pot, of a choker valve controlling the exit of ,metal from said pot, and mechanism 'for governing the movement -of said choker valve, including an operating spindle rotatably mounted in said melting pot' and engaging said choker Valve, a segmental gear-carried by said spindle and acam controlled rack meshing with said gear.

6. In metal injecting mechanism for type casting nrachines, the combination with a melting pot, of a choker valve, controllingy the exit of metal from said pot, and means for actuating said chker valve, comprlsing an operating spindle, rotatably mounted in 2 said pot and engaging said choker valve, a -segmental ge/arl carried by said spindle, a rack 'meshing'with said gear, a cam actuated plunger, and a yielding connection betweengsaid plunger and said rack.

7. In metal injecting mechanism for type casting machines, the combination with a mechanism for actuating said choker valve, comprising an operating spindle, rotatably `mounted insaid pot and engaging said choker valve,` a segmental gear carried by said spindle, a rack meshing with said gear,

a cam controlled plunger carrying a rod,

choker valve controlling the exit of molten metalfrom said pot, mechanism for actuating said choker valve, 'comprising an operating spindle rotatably mounted in said natanti' means operating to close said choker valve when the meltingpot is swung to disengage said gear from said rack.

9. ln metal injecting mechanism for type casting machines, the combination with amelting pot, pivoted so as to be swung, of a choker valve controlling the exit of molten metal from said pot, mechanism for actuating said choker valve, comprising an operating spindle rotatably mounted in said pot,

and engaging said choker valve, a segmental gear carried by said spindle, a rack meshing with said gear, cam operated mechanism forl reciprocatmg said rack, and safety means operating to close said choker valve when the melting pot is swung to disengage said gear from said rack, said safety means comprising an arm carried by .said spindle and spring means for moving said arm to rotate said spindle toV close said choker valve when the gear is disengaged from saidrack.

10. A type-casting metal-injecting mechanism, comprising a melting pot, a cylindrical chamber in the lower portion of the same, a pump-rod reciprocating in said chamber. a parallel cylindrical chamber having its bottom on a lower level than said first-mentioned cylindrical chamber, a hollow valverod movable in said parallel chamber and having a transverse port through the wall of said hollow portion thereof, a passage connecting the bottom ends of said parallel chambers, a third chamber of different diameters positioned above the bottom of the pump rod chamber, a cylindricalvalve reciprocating in said third chamber and guided in its movements by the smaller diameter of said third chamber, and an inclined passage connecting the enlarged diameter of said third chamber with the pump-rod chamber.

1l. ln type-casting apparatus, metal injecting mechanism, comprising a metal pot, two vertical, parallel, cylindrical chambers in the lower portion of the pot, a solid rod reciprocating in one of said chambers, a hollow rod reciprocating in the other of said chambers, a cylindricalfpassage of varying' diameters disposed at right angles to said parallel chambers and disposed in a plane above the bottom of said parallel c linders, a cylindrical one-seated valve, nc-

tioning as a choker-valve, reciproeating in said right-angled passage and guided in its movements by the smaller diameter thereof, and having a transverse groove for engagement by valve-operating-means, and having a reduced,-tapering portion projecting into the larger diameter of said right-angled passage, a hollow nozzle secured to the end of the larger diameter of saidright-angled passage, the outer portion of said hollow nozzle being provided with inner and outer valve-seats, the inner valve-seat fitting the end of the tapering portion of said chokervalve and'forming a seat for the same, said nozzle being provided with an axial hole in the end thereof, constituting an exit passage when the choker-valve recedes from its seat.

l2. ln type-metal injecting mechanism for type-casting machines, the combination of a melting pot, a single-ended chokervalve controlling exit of metal from said pot and provided with a transverse notch for engagement with a tooth forming part of an operating-spindle arranged to oscillate,

a valve-seat on the operating valve-spindle to function against leakage of type metal, a segmental pinion for externally operating the said spindle, a spring to hold valveseat portion of operating spindle in contact with its seat, an extension arm tending to return operating spindle to its original position before displacement, anda spring in conjunction with same to assist in this function. i

Y 13. ln a melting pot injecting mechanism for type casting machines, the combination of a melting pot, of a single-ended chokervalfe controlling discharge of molten metal from said pot, said choker-valve being provided with a transverse notch for engage-a llel with the anis of choker-valve, thereby allowing the choker-valve to be withdrawn without displacing anything connected with the choker-valve operating spindle.

lin testimony whereof l hereunto affix my signatairen JAMES THMAS CARTER,

lill 

